Electric bell



(No Model.)

0. E. KELLS, Jr.

' ELECTRIC BELL.

Patented Mar. 17, 1885.

INVENTOR CflEdmund KeZZ8,J7-.

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CHARLES EDMUND KELLS, JR, OF NEW ORLEANS, LOUISIANA.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 313,941, dated March 17, 1885.

Application filed May 31, 1884. (No model.)

To (LZZ whom, it may concern.-

Be it known that I, CHARLES EDMUND KELLs, Jr., of New Orleans, in the parish of Orleans and State of Louisiana, have invented certain new and useful Improvements in Electric Bells, of which the following is a specification.

My invention is especially designed for an alarm-bell, and relates to that class 0t instruments in which a local or bell-ringing circuit is completed by the closing of the main circuit, or the circuit that connects with the windows, doors, or other places with which the alarmis connected.

The accompanying drawing is a plan view of my improved alarm bell, and shows diagrammatically the arrangement of the electric circuits.

The armature D of the clectroinagnet G is carried by a spring, E, secured to the frame or supporting plate A at F. The opposite or free end of this spring normally rests against an adjustable contact-screw, a, which works in a metallic post, I). The hammer G of the bell B is carried by or constitutes a pro longation ot' the armature D, as shown. A circuitchanger, rod, or contact-bar H is eccentrically pivoted to the plate A at c, and normally rests by gravity upon an insulated stop, (I. The outer end of the rod H, when turned to theleft, (asindicatcd by dotted lines,) falls by gravity upon and makes electrical contact with a stud, e. The lower and shorter end of the rod H is normally in contact with or in close proximity to the armature D, as shown by thefull lines in the drawing. When the armature is attracted,the rod is turned to the left, as indicated by dotted lines, and falls against the contact-stop e.

K L H are binding-posts for the circuit-coir nections.

The battery-connections are as follows: The line runs from one pole of the battery N to the binding-post L, to the spring E, contactscrew to, coils of electro-magnet, binding-post M, and thence through a switch. ES, to the opposite pole of the battery. Between the switch RS and the binding-post M the doors, windows, or other places T are connected, each door or window T being included in a separate loop of the circuit, and there may be any desired number, as is well understood. WVhen the instrument is set to give the alarm. the contact-bar H is in the normal position indicated by the full lines in the drawingl The circuit above described, which is indicated by the letter 50, will therefore be com pleted at every point except at the door or window T. The arrangement there is such that any movement will close the circuit. The armature D will be attracted, a stroke will be given on the bell, and the contact-bar H will be thrown into the position indicated by dottedlines. This completes a local ringing circuit, (indicated by y.) It runs from one pole of the battery N through the switch ES to the binding-post K; thence to the contact stop 0, contactbar H, wire 1 to the binding-post M; thence through the coils of the electro-magnet to the screw-contact a; thence by armature-spring E to the binding-post L and opposite pole of the battery. The bell will therefore automatically continue ringing, even though the circuit at T may again be broken, because it will be perceived that the circuit 3 is now entirely independent of that part of the circuit or between the hind ing-post M and the switch RS. Any one tampering with the door or windowT cannct therefore stop the ringing of the alarm. The bar H may readily be restored to its nor mal position by means of a pivoted rod, I, which vibrates between two stop-pins, and is operated to throw the bar H back into position by means of a cord, J, as clearly shown in the drawing.

RS represents any ordinary switch by means of which the apparatus may be thrown out of operation during the hours of the day when it is not needed. This may be done by opening the local ringing circuit y at the switch. The main circuit 00 may also be opened at the switch; or the circuit-completing device at the doors or windows may be of such a character that they may be thrown out of operation when desired.

I claim as my invention 1. The main circuit, the local ringing circuit, the clectro-magnet, the vibrating armature of said magnet, carrying the bell-hammer, the vertical pivoted gravity circuit-completing bar, arranged,when in its normal position,

with its lower end in contact with or in close I ture is attracted, the stop d, the contact e, and proximity to said armature, astop, 01, against the pivoted rod I, which serves to throw the which said bar normally lies, and the contact- I gravity-bar back upon its normal-supportingstop e, against which the pivoted baris thrown stop d. 15 5 to complete the ringing circuit when the ar- In testimony whereof I have hereunto submature is attracted. scribed my name.

2. The combination of the electro-ma net its armature, the main and local circuits? the CHARLES EDMUND KELLS 10 bar, arranged with its lower end in a position CHARLES E. KELLs,

vertical pivoted gravity circuit-completing Witnesses: to be struck by the armature when the armai B. J. JOHNSON. 

